Heathkit HA 10 Schematic Manual

Page 1

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HEATH COMPANY - BENTON HARBOR, MICHIGAN

Page 12

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WASHER

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#2 55 3I
PHENOLIC
SPACER

#6 SOLDER
LUG

#10 SOLDER
LUG

(CD

#6 SMALL
SOLDER LUG

.-

CONTROL SDLDER
LUG . ,

# 205~M 275
NEUTRALIZING
CAPACITOR PLATE

12260-23
CERAMIC PLATE CAP

#56 -4
CRYSTAL ,
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#207-3
E CABLE CLAM P
# 57 - 29
SiLICON
RECTIFIER

#7I-2
CERAM|C FEED-
THROUGH INSULATO R

. fl, 71-4 '
STANDOFF 59230-34
INSULATOR . PLATE CLIP

"#5455 -3l
BUSHING

Page 15

.Pages

PART PARTS DESCRIPTION
No. PerKit

Hardware (Cont'd,)

250-49 8 3-48 x 1/4" PHMS (pan head
machine screw)

250-50 10 10-32 x 3/8" PEMS (Phillips
head machine screw)

250-51 8 #10 sheet metal screw

250- 56 37 6-32 x 1/4" BHMS (binder
head mactfine screw)

250-89 44 6-32 X 3/8" BHMS (binder
heed machine screw)

250-93 3 8- 32 151/4" Allen head set-
screw

250-125 2 103-32 2: 1/2" THMS (truss.

head machine screw)

250-134 12 6- 32 123/4" RHMS (roundhead
machine screw)

250-137 10 3-32 x 3/8 PHMS (pan head
machine screw)

250-152 4 10-24 x 3/ RHMS (round
head machine screw)

250-189 1 10-24 x 7-1/2" resistor stud

250-190 1 8-32 x 2" FEMS neutralizing
capacitor adjust screw

251-1 16 Spade bolt

252-11 8 3-48 nut

252-3 99 6-32 nut

252-4 15 , 8-32 nut

252-7 6 3/ 8" control nut

252-28 1 8-32 mumbnut

252-30 10 10-24 nut '

252-31. 1 10-24 wing hut

252-39 ' 1 1/4 - 32 nut

253-1 24 #6 flat fiber washer

253-8 5 #10 flatflber washer, 1/2"OD

253-6 2 #10 flat fiber washer, 11/16"
013

253-10 3 3/3" conhol flat washer

253-16 1 Fiber shwlder washer

253-19 5 #10 flat steel washer, 3/4"
OD .

253-27 1 Thick steel washer

254-1 116 #6 lockwasher

254-2 14 #8 lockwasher

254-3 9 #10 lockwasher

254-4 6 3/8" control lock-washer

254-7 8 #3 lockwasher

254-14 1 #12 lockwasher

255-31 4 Phenolic spacer

259-1 10 #6 solder lug

259-2 1 #3 solder lug

259-5 1 #10 solder lug

259-6 2 #6 small solder lug

259-10 1 3/8" control solder lug

* 204-11249

204-11373

PART PARTS
w

No.

Controls-Switches

10~118 1
61-3 . 2
63-253 1
63-254- 1

Meter-Tubes
407-78
411-130
411-151
412-2
421-21

Metal Parts
100-M304F432

MNfiNv-u

, . 1
203-M228F434

HHH

204-15371

N7"

204-1437 5

205-14271
205-M272
ZOE-M273
205-MZ74F433

1
ZOE-M275 2
ZOE-M148 1
ZOE-M149 1
212-1343 1

HHI-l

Miscellaneous

56-!
57- 29
71-2

HHI-l

71-4
73-1
73-4
74-4
75-30
39-17
90~153
207-3
260-23
260-34
261~6
266-21
340-1

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HEATHI'iiT
DESCRIPTION

2 Km control

DPST toggle switch
Meter switch
Bend switch

1 ms, 50 12 meter
866Altube

811A tube

3 watt, 120 V lamp
15 amperefuse, 3A3

Chassis base

Front panel

Coil motmting bracket
Amplifier tube mounting
bracket

Neutralizing capacitor
mounting bracket

Filter capacitor mmmting '
bracket '

Chassis top plate

Rectifier tube mom-11mg plate
RF shield top plate

Esmztcheon plate
Neutralizing capacitor plate .
RF shield, from section

RF shield, rear section
Silver plated strap

Crystal diode

Silicon recfiier'
Ceramic feed-through
insulator

Ceramic standoff insulator
3/6" rubber grommet
5/16" rubber grommet
Roll 11! tape

Line cord strain relief
Line cord '
Cabinet

Cable clamp

Ceramic plate cap
Spring type plate clip
Rubber feet

Fan blade »
Length #14 here wire

Page 36

I-I EATHKIT

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( )

Open the plug to expose the screw termi-
:1

Split the cord approximately 1" backirom
the end and separate the two wires.

Strip the ends of the wires back 1/2'l and
lightly tin the bare strands. Position the cord
in the "bell" of the plug, runthe wires along
the separate channels provided and con-
nect the wires to the screw terminals.
Use a hook in the same direction as the
screw rotation.

Reassemble the plug and install two type
3A3 fuses rated nothigher than 15 amperes.
Four 15 ampere fuses are supplied.

Place the 1-11/16" steel shaft extension
through the bushing into the shaft coupling
on the TUNING capacitor. Secure witha 6-32
x 1/4" BHMS.

Place two 8-32 x 1/4" Allen setscrews in
one of the large cast knobs.

Fully mesh the plates of the TUNING ca-
pacitor. By running your finger under the
capacitor plates, the exact position when
the plates are fully meshed can be easily
determined.

( )Referring to Detail 8D, secure the large

knob to the TUNING shaft extension withthe
pointer aligned to the set mark below the
80mmeter marking.

( ) Secure a large lunch to the BAND switch

shalt, usingtwo 8- 32 x 1/ Allen setscrews.
Rotate the switch shaft to its full counter-
clockwise position and tighten the setscrews
with the lamb pointer atthe 10-meter marl:-

mg.

(I)

(')

(V)

Page 2'7

' TUNING

ON
FRONT PANEL

KNDI

'Detail 8D

Rotate the IDADING capacitor shaft to the
full counterclockwise position. Secure a
large knob to the shaft using two 8~32 x
1/4" Allen setscrews. Orient the knob so
that the pointer is at the zero position and
tighten the setscrews.

Place the small metal knobs on the METER
switch shaft and RELATIVE POWER con-
trol shaft. With both the switch and control
shafts in their full counterclockwise posi-
tion, orient the switch knob pointer to
GRID and the control knob pointer to a 7
o'clock position. Secure with 8-32 x 1/ '7'
Allen setscrews.

Place the small red knob on theRF Monitor
level control on the rear of the chassis.

Since there is very little wiring in the
HA-lfl, a wiring harness was not considered
practical. However, the wiring maybe made
to look heater if the wires along the sides
of the chassis are taped or tied together
at various points.

Page 37

Page 28

@

TESTING

LETHAL VOLTAGES ARE PRESENT IN AN
AMPLIFIER OF THIS SIZE. CONSEQUENTLY,
GREAT CARE MUST BE EXERCISE!) WHEN
ANY TESTS OR ADJUSTMENTS ARE MADE.

( ) Put both the POWER and H17 switches in
their OFF position.

( )DO NOT install the 866A tubes in their
sockets at this time.

( ) Temporarily jumperthe two screwtermirmls
on the rear apron marked CUT OFF BIAS.
A short piece of hookup wire connected be-
tween the terminals will suffice.

( ) Plug the amplifier into a 117 volts AC, 60
cycle outlet. This outlet should be of
modern design and fedwith wire not smaller
than #14.

( )' Turn the POWER switch ON. The filaments
in file 811A tubes should light and the

cooling fan should start. The green pilot
light should be lit.

( )lum the POWER switch OFF. Set the
amplifier on its side. '

( )Tum the POWER switch ON. Check the
voltage between lug 3 of tube. socket V2
and chassis ground, The reading should be
4.5 volts me five. Use a HEATHKI'I VOM,
or equivalent 20,500 ohms/volt meter, for
this measurement.

( ) Check the voltage between the following
points and the chassis: lug 3 of V1, lug 3
of V3, lug 3 of V4. In all cases the voltage
should be 4.5 volts negative.

( ) Set the amplifier upright.

( ) Disconnect the amplifier from the 117 volt
outlet.

( ) At this point, the meter scale should be

studied to determine just What the meter
will indicate for the various positions of
the METER switch. Refer to table below.

( ) Place the two 866A rectifier tubes in their
sockets near the plate transformer.

( ) Place one of the ceramic plate caps 011th
866A.

( ) Reconnect the amplifier to the 11? volt AC
outlet and turn the POWER switch ON.

( ) Let the rectifier tubes warm up a mini-
mum 0! 30 minutesbefore proceeding with
testing. This warm up time is needed to
vaporize the mercury in these tubes. If the

' amplifier is moved, this warmup period
. should be repeated.

METER SWITCH POSITION

ME ASURES RANGE

GRID Grid Current 0-200 m. _

PLATE ' Plate Current 0.1000 ma

REL. PWR. Relative Voltage Adjustable By
Developed In Tramp Sensitivity Control
mission Llue

H'V Plate Voltage 0-2000 volts